/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.it.query;

import org.apache.iotdb.it.env.EnvFactory;
import org.apache.iotdb.it.framework.IoTDBTestRunner;
import org.apache.iotdb.itbase.category.ClusterIT;
import org.apache.iotdb.itbase.category.LocalStandaloneIT;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.sql.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.junit.Assert.fail;

@RunWith(IoTDBTestRunner.class)
@Category({LocalStandaloneIT.class, ClusterIT.class})
public class IoTDBFuzzyQueryIT {
    private static List<String> sqls = new ArrayList<>();

    @BeforeClass
    public static void setUp() throws Exception {
        EnvFactory.getEnv().initBeforeClass();
        initCreateSQLStatement();
        insertData();
    }

    @AfterClass
    public static void tearDown() throws Exception {
        EnvFactory.getEnv().cleanAfterClass();
    }

    private static void initCreateSQLStatement() {
        sqls.add("CREATE DATABASE root.t1");
        sqls.add("CREATE TIMESERIES root.t1.wf01.wt01.status WITH DATATYPE=TEXT, ENCODING=PLAIN");
        sqls.add("CREATE TIMESERIES root.t1.wf01.wt01.temperature WITH DATATYPE=FLOAT, ENCODING=RLE");
        sqls.add("CREATE TIMESERIES root.t1.wf01.wt02.status WITH DATATYPE=TEXT, ENCODING=PLAIN");

        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465600000,'1',12.1)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465660000,'14',13.1)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465720000,'616',5.5)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465780000,'626',8.1)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465840000,'6116',4.3)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465900000,'6%16',10.3)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509465960000,'8[sS]*',11.3)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509466020000,'%123',18.3)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509466080000,'123%',18.3)");
        sqls.add(
                "insert into root.t1.wf01.wt01 (time,status,temperature) values (1509466090000,'\\\\',10.3)");
        sqls.add("insert into root.t1.wf01.wt02 (time,status) values (1509465600000,'14')");
    }

    private static void insertData() throws SQLException {

        Connection connection = EnvFactory.getEnv().getConnection();
        Statement statement = connection.createStatement();

        for (String sql : sqls) {
            statement.execute(sql);
        }
        statement.close();
    }

    @Test
    public void testLike() throws SQLException {
        Connection connection = EnvFactory.getEnv().getConnection();
        Statement st0 = connection.createStatement();
        ResultSet resultSet =
                st0.executeQuery("select status from root.t1.wf01.wt01 where status like '1'");

        Assert.assertEquals("1", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '%'");

        Assert.assertEquals("1,14,616,626,6116,6%16,8[sS]*,%123,123%,\\\\", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '1%'");

        Assert.assertEquals("1,14,123%", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '%1%'");

        Assert.assertEquals("1,14,616,6116,6%16,%123,123%", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '6%6'");

        Assert.assertEquals("616,626,6116,6%16", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '1_'");

        Assert.assertEquals("14", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '6_1%'");

        Assert.assertEquals("6116,6%16", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '6\\%%'");

        Assert.assertEquals("6%16", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '\\%%'");

        Assert.assertEquals("%123", outputResultStr(resultSet));

        resultSet = st0.executeQuery("select status from root.t1.wf01.wt01 where status like '%\\%'");

        Assert.assertEquals("123%", outputResultStr(resultSet));

        resultSet =
                st0.executeQuery("select status from root.t1.wf01.wt01 where status like '%\\\\\\\\%'");

        Assert.assertEquals("\\\\", outputResultStr(resultSet));
    }

    @Test(expected = Exception.class)
    public void testLikeNonTextCloumn() throws SQLException {
        Connection connection = EnvFactory.getEnv().getConnection();
        Statement st1 = connection.createStatement();
        st1.executeQuery("select * from root.t1.wf01.wt01 where temperature like '1'");
    }

    private String outputResultStr(ResultSet resultSet) throws SQLException {
        StringBuilder resultBuilder = new StringBuilder();
        while (resultSet.next()) {
            resultBuilder.append(resultSet.getString(2)).append(",");
        }
        String result = resultBuilder.toString();
        return result.substring(0, result.length() - 1);
    }

    private List<Integer> checkHeader(
            ResultSetMetaData resultSetMetaData, String expectedHeaderStrings, int[] expectedTypes)
            throws SQLException {
        String[] expectedHeaders = expectedHeaderStrings.split(",");
        Map<String, Integer> expectedHeaderToTypeIndexMap = new HashMap<>();
        for (int i = 0; i < expectedHeaders.length; ++i) {
            expectedHeaderToTypeIndexMap.put(expectedHeaders[i], i);
        }

        List<Integer> actualIndexToExpectedIndexList = new ArrayList<>();
        for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
            Integer typeIndex = expectedHeaderToTypeIndexMap.get(resultSetMetaData.getColumnName(i));
            Assert.assertNotNull(typeIndex);
            Assert.assertEquals(expectedTypes[typeIndex], resultSetMetaData.getColumnType(i));
            actualIndexToExpectedIndexList.add(typeIndex);
        }
        return actualIndexToExpectedIndexList;
    }

    @Test
    public void selectLikeAlignByDevice() throws ClassNotFoundException {
        String[] retArray =
                new String[]{"1509465660000,root.t1.wf01.wt01,14,", "1509465600000,root.t1.wf01.wt02,14"};
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {

            try (ResultSet resultSet =
                         statement.executeQuery(
                                 "select status from root.t1.wf01.wt0* where status like '14%' align by device")) {
                ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
                List<Integer> actualIndexToExpectedIndexList =
                        checkHeader(
                                resultSetMetaData,
                                "Time,Device,status,",
                                new int[]{Types.TIMESTAMP, Types.VARCHAR, Types.VARCHAR});

                int cnt = 0;
                while (resultSet.next()) {
                    String[] expectedStrings = retArray[cnt].split(",");
                    StringBuilder expectedBuilder = new StringBuilder();
                    StringBuilder actualBuilder = new StringBuilder();
                    for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
                        actualBuilder.append(resultSet.getString(i)).append(",");
                        expectedBuilder
                                .append(expectedStrings[actualIndexToExpectedIndexList.get(i - 1)])
                                .append(",");
                    }
                    Assert.assertEquals(expectedBuilder.toString(), actualBuilder.toString());
                    cnt++;
                }
                Assert.assertEquals(2, cnt);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Test
    public void selectRegexpAlignByDevice() throws ClassNotFoundException {
        String[] retArray =
                new String[]{
                        "1509465600000,root.t1.wf01.wt01,1,",
                        "1509465660000,root.t1.wf01.wt01,14,",
                        "1509466080000,root.t1.wf01.wt01,123%,",
                        "1509465600000,root.t1.wf01.wt02,14,"
                };

        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {

            try (ResultSet resultSet =
                         statement.executeQuery(
                                 "select status from root.t1.wf01.wt0* where status regexp '^1.*' align by device");) {
                ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
                List<Integer> actualIndexToExpectedIndexList =
                        checkHeader(
                                resultSetMetaData,
                                "Time,Device,status,",
                                new int[]{Types.TIMESTAMP, Types.VARCHAR, Types.VARCHAR});

                int cnt = 0;
                while (resultSet.next()) {
                    String[] expectedStrings = retArray[cnt].split(",");
                    StringBuilder expectedBuilder = new StringBuilder();
                    StringBuilder actualBuilder = new StringBuilder();
                    for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
                        actualBuilder.append(resultSet.getString(i)).append(",");
                        expectedBuilder
                                .append(expectedStrings[actualIndexToExpectedIndexList.get(i - 1)])
                                .append(",");
                    }
                    Assert.assertEquals(expectedBuilder.toString(), actualBuilder.toString());
                    cnt++;
                }
                Assert.assertEquals(4, cnt);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }
}
